package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import com.sun.imageio.plugins.common.BitFile;
import jdk.nashorn.internal.runtime.ScriptEnvironment;
import jdk.nashorn.internal.runtime.regexp.joni.Regex;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.print.DocFlavor;
import javax.servlet.http.HttpSession;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {


    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合，返回错误信息
            return Result.fail("手机格式错误");
        }
        //3.符合，生成验证码
        String code= RandomUtil.randomNumbers(6);
        //4.保存验证码到session
//        session.setAttribute("code",code);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送验证码成功，验证码：{}",code);
        //返回OK
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone=loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合，返回错误信息
            return Result.fail("手机格式错误");
        }
        //校验验证码
        //Object cacheCode=session.getAttribute("code");
        String cacheCode=stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code=loginForm.getCode();
        if(cacheCode==null||!cacheCode.equals(code))
        {
            //3.不一致，报错
            return Result.fail("验证码错误");
        }

        //4.一致，根据手机号查询用户 select * from tb_user where phone =?
        User user=query().eq("phone",phone).one();

        //5.判断用户是否存在
        if (user==null){
            //6.不存在，创建新用户并保存
            user= createUserWithPhone(phone);
        }
        //7.保存用户信息到session
        //session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));;
        //7.保存用户信息到redis
        //7.1随机生成token，作为登陆令牌
        String token = UUID.randomUUID().toString(true);
        //7.2将User对象转换为HashMap存储
        UserDTO userDTO=BeanUtil.copyProperties(user,UserDTO.class);
        Map<String,Object> userMap=BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //7.3存储
        String tokenKey=LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //7.4设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone){
        //1.创建用户
        User user=new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }

    @Override
    public Result sign() {
        //获取当前登录用户
        Long userId= UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now=LocalDateTime.now();
        //拼接key
        String keySuffix=now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key=USER_SIGN_KEY+userId+keySuffix;
        //获取今天是本月第几天
        int dayOfMonth=now.getDayOfMonth();
        //写入Redis SETBIT key offset
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //获取当前登录用户
        Long userId= UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now=LocalDateTime.now();
        //拼接key
        String keySuffix=now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key=USER_SIGN_KEY+userId+keySuffix;
        //获取今天是本月第几天
        int dayOfMonth=now.getDayOfMonth();
        //获取本月截至今天为止所有签到记录，返回的是一个十进制数字
        List<Long> result=stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result==null||result.isEmpty()){
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num=result.get(0);
        if(num==null||num==0){
            return Result.ok(0);
        }
        //循环遍历
        int count=0;
        while(true){
            //让这个数字与1做与运算，得到最后一个bit位
            if((num&1)==0){
                //如果为0,说明未签到，结束
                break;
            }else {
                //如果不为0，说明已签到，计数器+1
                count++;
            }
            //把数字右移一位，丢掉最后一位，继续下一bit位
            num>>>=1;
        }
        return Result.ok(count);
    }
}
